This study intends to investigate the overall information activities of Korean ethnic community in Japan, and to discuss about the relevance between such information activities and the information needs of Korean residents in Japan. To the end, 51 Korean ethnic organizations and media were visited for the investigation of their information activities, and 767 Korean residents were surveyed and 65 Korean residents were interviewed for the assessment of their information need and behavior. The discussion includes: (1) the everyday information need and behavior of Korean residents in Japan, (2) the major information activities of Korean ethnic organizations and media, (3) the relevance of the Koreans' information behavior and the Korean organizations' information activities, and finally (4) a suggestion on the desirable future directions and roles that the Korean ethnic organizations and media should seek for the overall Korean ethnic community's healthy development.